PPT-Embryonic Membranes and the Placenta

Placenta and Fetal Membranes Amnion Epiblast Extraembryonic Mesoderm Yolk Sac Hypoblast Extraembryonic Mesoderm Allantois Embryonic Hindgut Chorion Trophoblasts . Maleness induced by hormones from the developing testis.. Reproduction. “Indifferent” ducts . of embryo. Y chromosome . present. Y chromosome . absent. penis. testis. ovary. uterus. vagina. Male. Fertilization. After breeding, the sperm and egg unite to form a . zygote. . After the nuclei have fused the zygote becomes an . embryo. . Embryos do not have any anatomical form.. Fertilization. Fetus. Fertilization. After breeding, the sperm and egg unite to form a . zygote. . After the nuclei have fused the zygote becomes an . embryo. . Embryos do not have any anatomical form.. Fertilization. Fetus. their functions. By. Dr. R. C. . Nath. ; Associate Professor. Department . of Zoology. Govt. Degree College, DMR. .. Fig: Chick’s egg with different regions. Definition of Extra Embryonic Membrane:. Definition of Extra Embryonic Membrane:. The blastoderm . . in birds , reptiles and mammals not only gives rise to embryo, but also to certain structures that lie outside the embryo. These extra embryonic structures are called Extra Embryonic Membrane.. Chapter 18 . Learning . Targets. Explain the process of fertilization and the conversion of egg into a zygote.. Name & give the function of the 4 extra embryonic membranes.. Describe the structures & functions of the placenta & umbilical cord.. Developmental stages of humans. Fertilization. Zygote. It is a fertilized . egg . Diploid (2n). Female . pronuclei. Male . pronuclei. Amphimixis. Developmental stages of humans. Zona. . pellucida. Surrounds the zygote. Gabr. Objectives. By the end of this lecture, the student should be able to:. Describe the structure, functions, anomalies of the placenta. Describe the structure, functions, anomalies of the . umbilical cord. E-mail: . a.al-nuaimi@sheffield.ac.uk. E. mail: abdulameerh@yahoo.com . Prof. . Abdulameer. Al-. Nuaimi. 25. Placenta. The placenta. , begins to form in the first week 4 of pregnancy, it continues to develop over the next couple of months, with smaller capillaries turning into blood vessels and delivering nutrients and oxygen to the growing baby. . Dr. . Bhavna. Asstt. . Prof. . Deptt. . Of VGO. Introduction. . The fetal membranes are normally expelled during the third stage of labor.. The membranes are said to be retained whenever the . third stage of labor is prolonged. The origin of the fetal membrane from the trophoblast . Temporary fetal membrane . Yolk sac . Permanent fetal membrane . Amnion . Allantois . Chorion . Yolk sac . Origin : endoderm . Stay for 4-6 weeks (after that there is no any effect for it). Vohra. vohra@ksu.edu.sa. OBJECTIVES. By the end of the lecture the student should be able to:. List the components of the fetal membranes.. Describe the stages of development of the components.. Describe the structure and function of the components.. OBJECTIVES. By the end of the lecture the student should be able to:. List the components of the fetal membranes.. Describe the stages of development of the components.. Describe the structure and function of the components.. By the end of the lecture the student should be able to:. List the components of the fetal membranes.. Describe the stages of development of the components.. Describe the structure and function of the components..